JP2009041658A - Fitted and fixed structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixed structure for minimizing a protrusion on the back side of a mounting hole. <P>SOLUTION: A shaft member 11 and a pressure receiver 12 are connected to each other with a cam 13 inserted through a cam receiving hole 16. The cam 13 has a shape of an elliptical column, and the cam receiving hole 16 is also sectionally shaped to be approximately elliptical. The cam 13 is detachably positioned and the pressure receiver 12 is inserted into the mounting hole, and the shaft member 11 is turned to set the cam 13 at a fixed position. The pressure receiver 12 tends to be enlarged in diameter and deformed by the pressure of the cam 13 but is regulated by the inner peripheral face of the mounting hole, and therefor so the pressure receiver 12 is pressed against the inner peripheral face of the mounting hole. Thus, the fitted and fixed structure 10 is fixed to the mounting hole. The structure is fixed by only inserting the pressure receiver 12 into the mounting hole and turning the cam 13 (the shaft member 11), therefore eliminating the need for a portion protruded on the back side of the mounting hole. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention belongs to the technical field of a fitting and fixing structure for fitting and fixing a component or the like in a mounting hole.

  Various fixing structures (fasteners) for fixing to a mounting hole such as a synthetic resin part have been proposed. For example, as in the case of an arrowhead-type snap, many conventional fasteners require a portion that protrudes behind the mounting hole.

  As mentioned above, if the fixed structure that requires the part protruding to the back side of the mounting hole is necessary, space is also required on the back side of the hole, and work on the back side of the hole is required to remove it. There was also.

  The present invention aims to solve such problems.

The fitting and fixing structure according to claim 1 is:
A shaft member and a pressure receiving body,
The shaft member and the pressure receiving body are configured such that the cam portion of the shaft member is inserted into the cam receiving hole of the pressure receiving body, and the cam portion inserted through the cam receiving hole is relatively positioned between the attachment / detachment position and the fixing position. Connected rotatably,
The cam portion is provided with a long diameter portion where the distance from the shaft center to the outer peripheral surface is relatively long and a short diameter portion where the distance is relatively short,
The inner periphery of the cam receiving hole is shaped to generate a force in a direction in which the pressure receiving body is expanded and deformed by being partially compressed by the long diameter portion when the cam portion is in the fixed position. Features.

In order to perform the fixing by the fitting and fixing structure according to the first aspect, first, the cam portion inserted through the cam receiving hole of the pressure receiving body is set to the attaching / detaching position, and the pressure receiving body is inserted into the mounting hole.
Next, the shaft member is turned to bring the cam portion into a fixed position.

  The cam portion is provided with a long diameter portion where the distance from the shaft center to the outer peripheral surface is relatively long and a short diameter portion where this distance is relatively short. When it is in the fixed position, a part of the long diameter portion is compressed and a force is generated in a direction that causes the pressure receiving body to expand and deform.

  For this reason, when the shaft member is turned to bring the cam portion to the fixed position, the pressure receiving body tends to expand and deform, but since the pressure receiving body is inserted into the mounting hole, the diameter expanding deformation is It is regulated by the hole (its inner peripheral surface). Therefore, the force for expanding and deforming the pressure receiving member acts as a force for pressing the outer surface of the pressure receiving member against the inner peripheral surface of the mounting hole.

  When the shaft member is turned to place the cam portion in a fixed position, for example, the long diameter portion of the cam portion fits into a recess provided in the cam receiving hole, so that the response and click feeling are felt. As a result, the cam portion can be surely set at a fixed position, and workability is improved.

  As described above, the pressure receiving body can be fixed by simply inserting the pressure receiving body into the mounting hole and turning the cam portion (shaft member), so a portion protruding to the back side of the mounting hole is not essential (at least the protruding amount can be reduced). ). For this reason, the space which should be ensured on the back side of a hole can be made very small. Further, if the cam portion (shaft member) is turned back to the attachment / detachment position, the pressure receiving body can be pulled out from the attachment hole, that is, can be removed, so that no work on the back side of the hole is required for removal.

Next, embodiments of the present invention will be described based on examples of the present invention. The present invention is not limited to the following examples and the like, and it goes without saying that the present invention can be implemented in various ways without departing from the gist of the present invention.
[Example]
In this embodiment, the fitting and fixing structure of the present invention is applied to a clamp.

  As shown in FIG. 1, the clamp 1 includes a base 2, a support wall 3 erected on one end of the base 2, a lock wall 4 erected on the base 2 opposite to the support wall 3, and a hinge 5. The movable portion 6 connected to the support wall 3, the elastic portion 7 connected to the distal end portion of the movable portion 6, and the like.

  When the movable part 6 is tilted so as to be bent at the hinge part 5, the elastic part 7 is caused to enter a receiving hole (not shown) provided at the front end of the lock wall 4, and the locking projection 8 of the elastic part 7 is engaged. It can be made to latch on the convex part (not shown) provided inside the receiving hole. Thereby, since a closed ring is formed by the base part 2, the support wall 3, the lock wall 4, and the movable part 6, long objects, such as a cable, can be hold | maintained by this closed ring. Moreover, if the latching | locking protrusion 8 is cancelled | released by operating the elastic part 7, the above-mentioned closing ring can be eliminated.

A fitting and fixing structure 10 is disposed under the base 2.
The fitting and fixing structure 10 includes a shaft member 11 connected to the lower surface of the base portion 2 and a pressure receiving body 12 fitted thereto.

  The distal end portion of the shaft member 11 is tapered to facilitate the fitting operation of the pressure receiving body 12, but the upper portion is a cam portion 13. The cross-sectional shape of the cam part 13 is an ellipse as shown in FIG.1 (e), and the cam part 13 is an elliptic cylinder.

  The appropriate range centered on the long axis of the cam portion 13 corresponds to a long diameter portion where the distance from the shaft center to the outer peripheral surface is relatively long, and the appropriate range centered on the short axis (however, does not overlap with the long diameter portion) ) Corresponds to a short axis portion where the distance is relatively short.

  The pressure receiving body 12 includes a substantially rectangular parallelepiped main body portion 14 and an upper end flange portion 15, and a cam receiving hole 16 extends from the flange portion 15 to the lower end of the main body portion 14. As shown in FIGS. 1C and 1E, the cross-sectional shape of the cam receiving hole 16 is elliptical.

  However, since the flange portion 15 and the main body portion 14 are provided with slits 17 and the slits 17 communicate with the cam receiving holes 16, the cam receiving holes 16 are not complete elliptical holes, and some of them are slits. Opened at 17.

  In the state shown in FIG. 1 (e), both the cam receiving hole 16 and the cam portion 13 have the major axis in the horizontal direction in the figure and the minor axis in the vertical direction in the figure. In this way, the long axis of the cam part 13 is aligned with the long axis of the cam receiving hole 16 in the attachment / detachment position of the cam part 13.

  The clamp 1 (including the shaft member 11) is a molded product of hard synthetic resin (for example, polyethylene, polypropylene, polyamide, ABS, etc.), and the pressure receiving body 12 is also a molded product of the same material.

Next, fixation to the hole for attachment of the fitting fixing structure 10 is demonstrated.
As described above, the cam receiving hole 16 and the cam portion 13 are both elliptical, and when the cam portion 13 is at the attachment / detachment position (FIG. 1 (e)), both major and minor axes are aligned.

  On the other hand, the cam portion 13 and the pressure receiving body 12 are rotated relative to each other around the central axis of the cam portion 13, and as shown in FIG. 2, the long axis of the cam portion 13 and the short axis of the cam receiving hole 16, the cam portion 13. When the short axis and the long axis of the cam receiving hole 16 are aligned (the position where the cam part 13 is fixed), the portion near the long axis of the cam part 13 presses the inner peripheral surface of the cam receiving hole 16.

In this case, if the pressure receiving body 12 is not restrained at all, as shown in FIGS. 2E and 2G, the pressure receiving body 12 is deformed so as to widen the interval between the slits 17 (diameter expansion deformation).
However, if the main body portion 14 of the pressure receiving body 12 is inserted into a mounting hole having an inner peripheral shape corresponding to the outer peripheral shape (clearance enough to slide when inserted), the diameter expansion deformation is caused by the inner peripheral surface of the mounting hole. Since it is regulated, the diameter expansion deformation as shown in FIGS. 2E and 2G does not occur.

  For this reason, the force which expands and deforms the pressure receiving body 12 produced because the cam part 13 was made into the fixed position acts as a force which crimps | bonds the outer surface of the pressure receiving body 12 to the internal peripheral surface of an attachment hole. Thereby, the fitting fixing structure 10 is fixed to the mounting hole. That is, the clamp 1 is attached to a member provided with an attachment hole.

  Since the pressure receiving body 12 is inserted into the mounting hole and can be fixed simply by turning the cam portion 13 (shaft member 11), a portion protruding to the back side of the mounting hole is not essential (at least the protruding amount can be reduced). For this reason, the space which should be ensured on the back side of a mounting hole can be made very small. Moreover, if the cam part 13 (shaft member 11) is rotated and returned to the attachment / detachment position, the pressure receiving body 12 can be pulled out from the attachment hole, that is, can be removed, so that no work on the back side of the attachment hole is required for removal.

  Note that when the cam portion 13 is turned to the fixed position, one end of the long axis of the cam portion 13 fits into the slit 17, so that a click feeling is generated at this time. By this click feeling, the operator can confirm that the cam portion 13 is in the fixed position, and the workability is improved.

In addition, in the case of an arrowhead type snap which is one of the prior arts, the mounting plate may be bent by pressing when it is inserted into the mounting hole of a thin mounting plate (thin sheet metal, thin substrate, etc.). However, in the case of the fitting and fixing structure 10 of the present invention, a force that causes the mounting plate to bend does not occur. Therefore, the fitting and fixing structure 10 is extremely useful for mounting to a place where bending is not desired.
[Shading type]
As shown in FIGS. 3A to 3C, the pressure receiving body 12 of the above example has a cam receiving hole 16 formed therethrough. For this reason, when the fitting and fixing structure 10 is fixed to the mounting hole as described above, a slight gap is formed between the cam portion 13 and the cam receiving hole 16. Then, light may leak from the gap depending on the place of use or application of the component (clamp 1 in the above example) provided with the fitting and fixing structure 10.

In applications where light leakage is not desired, a light-shielding pressure receiving body 30 having the configuration illustrated in FIGS. 3D to 3F may be used.
The pressure receiving body 30 has a structure in which the pressure receiving body 12 of the above example is covered with an outer skin 31. The outer skin 31 is provided with an accommodation hole 32 for accommodating the pressure receiving body 12, and the pressure receiving body 12 is held in the accommodation hole 332 without looseness. Such a structure can be obtained by a known technique such as molding the outer skin 31 by inserting the pressure receiving body 12. Since the housing hole 32 of the outer skin 31 has a bottom 33 and closes the lower end opening of the cam receiving hole 16, light leakage caused by a gap formed between the cam portion 13 and the cam receiving hole 16 is prevented. Is done.

  Further, not only light leakage but also fine dust and droplets can be prevented from entering through a gap formed between the cam portion 13 and the cam receiving hole 16.

The front view (a) and bottom view (b) of the clamp of an Example, the top view (c) of a fitting fixation structure, a front view (d), AA sectional drawing (e), and a side view (f). It is attachment explanatory drawing of the fitting fixing structure of an Example, A pressure receiving body is restrained with the top view (a) of an attachment state, a front view (b), BB sectional drawing (c), and a side view (d). A plan view (e), a front view (f), a CC cross-sectional view (g), and a side view (h). It is structure explanatory drawing of a pressure receiving body, The top view (a) of a pressure receiving body of an Example, front view (b), DD sectional drawing (c), the top view (d) of a light-shielding type pressure receiving body, front Drawing (e) and EE sectional view (f).

Explanation of symbols

1 ... Clamp,
10 ... Fitting fixing structure,
11 ... shaft member,
12 ... pressure receiving body,
13 ... Cam part,
14 ... body part,
16: Cam receiving hole,
17 ... slit,
30 ... pressure receiving body,
31 ... outer body.

Claims (1)

A shaft member and a pressure receiving body,
The shaft member and the pressure receiving body are configured such that the cam portion of the shaft member is inserted into the cam receiving hole of the pressure receiving body, and the cam portion inserted through the cam receiving hole is relatively positioned between the attachment / detachment position and the fixing position. Connected rotatably,
The cam portion is provided with a long diameter portion where the distance from the shaft center to the outer peripheral surface is relatively long and a short diameter portion where the distance is relatively short,
The inner periphery of the cam receiving hole is shaped to generate a force in a direction in which the pressure receiving body is expanded and deformed by being partially compressed by the long diameter portion when the cam portion is in the fixed position. Features a fitting and fixing structure.

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